Telephone-plug ejector.



H. B. RODIER.

TELEPHONE PLUG HECTOR.

APPLICATION FILED 050.30. I9I5.

Patented May 29, 1917.

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H. B. RODIER.

TELEPHONE PLUG EJECTOR.

APPLICATION FILED nEc.:I0. 1915.

L., Patented May 29,1917.

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H. B. RODIER.

TELEPHONE PLUG EJECTOR.

APPLICATION man 920.30. 1915.

Lggg 'Patented May 29, 1917.

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T@ STATES PATENT @FFTQE HAROLD BARNHART RODIER, OF XVASI-IINGTON, DISTRICT OF COLUMBA, ALS-SIGNOR OF ONE-FOURTH TO IRVING N. BOERNSTEIN, ONE-FOURTH T0 AUL KOESTER, AND ONE-FOURTH TO ROBERT B. GOTTA, ALL OF W'AS-INGTON, DISTRIT OF COLUMBA.

TELEPHONE-PLUG EJECTOB.

Application led December 30, 1915.

To all whom t may concern.'

.Be it known that I, HAROLD B. Ronmn, a lcitizen of the United States, residing at Washington, in the District of Columbia, have invented new and useful Improvements in Telephone-Plug Ejectors, of which the following is a specification.

This invention relates to automatic ejectors for telephone plugs and has for its primary object the provision of an ejector, the operation of which is under the control vof the receiver hook of a sub-station.

Another object of the invention is to provide an electric system in which the ejecting solenoid is arrangedin a closed circuit 'only momentarily for cutting down current consumption.

A further object of my invention is to provide a Asystem including signaling means rendered active upon the movement of a receiver hook of a sub-station to abnormal position and said signaling means rendered -inactive by the insertion of the plug into the associated jack by the operator.

A still further object of the invention is to provi-de a circuit that includes a solenoid for eject-ing the plug with two breaks, one of which is arranged to be kept open 'upon the receiver hook of a sub-station moving to abnormal position, the other so arranged as to beclosed upon the insertion of the plug into its associated jack.

The invention yconsists in the features of construction, combination, and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying 'drawings in which:-

Figure 1 is a vertical section through a cabinet form of switch board showing my invention applied thereto.

Fig. 2 is an enlarged sectional view of the plug within its jack.

Fig. 3 is a diagrammatic view of the wiring system.

Fig. 4 is a diagrammatic view of a somew-hat similar system.

Fig. 5 is a sectional view of that form of,

solenoid used in the system illustrated in Fig. 4.

Referring tothe drawings, I 'have shown my invention applied to the well known Vi'orm-off cabinet switch board 1 in which ythe plugs'2 are held seated upon .the 'table 3by ymeans oflthe weights 4 engaging a 'loop por- Specication of Letters Patent.

Patented May 29, T9117 Serial No. 69,451.

tion of the cord conductors 5. rThe jacks 6 are of the well known construction, that is, cimprising spring clips 8, in this particular instance, two in number. Supported directly in the rear of each jack is a solenoid 9 the core 10 of which has attached thereto at its forward end, a rod 11 of non-magnetic material terminating in a head 12 having a concaved depression 13 adapted to receive the usual cylindrical head of the plug. When the plug is inserted into its jack, the head of the plug bearing against the head 12 forces the 'core 10 a predetermined distance beyond the end of the solenoid so that upon energization of the latter, the coil will be drawn into the solenoid with the result that the plug is forced from its jack. Tmmediately the plug is forced from its jack, the weight 4i seats the plug upon the table.

will now describe the wiring system for energizing the solenoid upon the inactivity of the sub-station associated with that particular jack. |The sub-station apparatus as shown comprises the usual receiver hook 14, normally resting upon a contact 15 that forms a portion -of my improvement. As is the usual practice, the pivot of the hook 14 is permanently connected to one of the line conductors upon which is tapped one end of the primary circuit of the transmitter 16 that has its remaining end connected to a Contact 17 normally spaced above the hook 14. Arranged parallel to the contact 17 is a similar contact 18 to which is connected the remaining line wire that includes the receiver and primary of the induction coil. The contact 15 is tapped on to the line conductor 19 by means of a wire 2O in which is arranged a signal bell 21. Tapped onto the contact 18 is a wire 22 grounded as indicated at 23. The line conductors 19 and 24 terminate in the usual jack 6 at the switch board, and coperating with this jack 6 is a plug 2 the ejection of which is automatically vperformed by my invention. Tapped onto the line conductor 24 .at the switch board is a wire 27 having arranged in series therewith a magnet 2.8 and a source of current 29; and, if found advantageous in practice, an impedance coil 30 may be arranged in the wire so as to prevent the passage i-nto the wire of pulsating current during the passing of conversation through the line wire. This wire 27 is grounded as indicated at 31 so as to complete a circuit with the wire 22 through the earth. Under the control of the magnet 23 is an armature 32 normally bridging a break in a circuit 33 that includes the solenoid 9 and a source of current 34. rThe circuit 33 is broken at a second point 35, the terminals thus formed being connected to the pivot of an armature 36 and a contact 37. The armature 36 is normally held retracted from the contact 37 in any suitable manner which may be by gravitational action or a coil spring, the latter being illustrated in the drawings. This armature 36 is under the control of an electric magnet 33 arranged in the circuit 39 having one terminal connected to the plug sleeve contact 26 and the other to the jack sleeve contact. This circuit 39 has arranged in seriestherewith a source of current 40 and an impedance coil 41, the purpose of the latter being to prevent pulsating current from entering the magnet 38.

The numeral 42 designates a signal lamp arranged in a conductor 43, the two terminals of which terminate in contacts 44`and 45, the contact 45, when the apparatus is in normal condition, engaging the armature 36 while the contact 44 is spaced from the armature 32.

From the foregoing description it will be seen that immediately the receiver is removed from the hook 14, the latter will engage the contact 18 for allowing current to flow from the source 29 through the magnet 28. This energization of the magnet 28 causes the armature 32 to engage the contact 44 with the result that the signal lamp 42 is illuminated by current received from the battery 34. Upon the operator insert-v ing the plug 26 into the jack 25, for the well known reasons, the magnet 33 will be energized which attracts the armature 36 and discontinues the current flow from the battery 34 to the lamp 42 and at the same time closes the break 35 in the circuit 33. Upon the subscriber of the substation hanging up his hook, the magnet 23 will be denergized which results in the armature 32 closing the break in the circuit 33 at this point. Thus it will be seen that the circuit 33 is closed at both breaks and current will flow from the battery 34 through the solenoid 9. The magnetism of the solenoid 9 draws in the core 10 which causes the head 12 to force the plug 26 out of engagement with the jack 25. Upon this action taking place, the magnet 38 will be rendered inactive and its associated armature 36 moves to a position to break the circuit 33 and engage the contact 45 for another operation.

In the modified form of my invention, I dispense with the magnet 38 and its circuit and also with the armature 36 and in place of the armature 36 I arrange a pair of spring contacts 46 adapted to be forced into engagement with each other by means of the core of the solenoid when the plug 26 forces it in a longitudinal direction, this action taking place when the plug is inserted into the jack.

From this arrangement, it will be seen that one of the breaks in the circuit 33 is normally closed when the core of the solenoid is in an inactive position, which position is brought about by the insertion of the plug into a jack. Immediately the solenoid is energized, the plugwill be ejected and the circuit broken at the contact 46. With the exception of the action just stated, the operation of the modied form of my invention is identical to that previously described.

Obviously, various changes could be made in certain parts of the apparatus by one skilled in the art without departing from the spirit and scope of the invention and for this reason, I desire not to be limited to the precise arrangement and construction of parts as described.

Having described the invention, what is claimed is:

1. A n automatic ejector for telephone plugs comprising a circuit including a source of current and a solenoid for ejecting said plug, a signal lamp, means under the control of the receiver hook of a sub-station for breaking said circuit and illuminating said lamp, and means energized upon the insertion of said plug into its jack for closing said circuit at another point and denergizing said lamp.

2. An automatic ejector for telephone plugs comprising a circuit including a source of current and a solenoid adapted to eject said plug when energized, a pair of switches in said circuit and normally assuming open and closed positions respectively, and means under the control of a receiver hook of a sub-station and the insertion of said plug into its jack for changing the normal condition of said switches.

3. An automatic ejector for telephone plugs comprising a circuit including a source .of current and a solenoid adapted to eject said plug when energized, a pair of switches in said circuit and normally assuming open and closed positions respectively, means under the control of a receiver hook of a substation and the insertion of said plug into its jack for changing the normal condition of said switches, and signaling means rendered active upon denergization of a portion of said first means.

4. An automatic ejector for a telephone comprising a circuit including a source of current, a solenoid for ejecting said plug, a pair of switches arranged in said circuit, a lamp in said circuit, means under the control of a sub-station receiver hook for opening one of said switches and energizing said lamp, and plug control means for closing the other of said switches.

5. An automatic ejector for a telephone comprising a circuit including a' source of 5 current and a solenoid for ejecting said plugv a pair of switches arranged in said circuit, a signal lamp in said circuit at a point between said switches, means under the control of a sub-station receiver hook 10 for opening one of said switches and tobe energized with said lamp and plug and control means for closing the other voi said switches and denergize said lamp.

In testimony whereof I aiiix my signature in presence of tWo Witnesses.

HAROLD BARNHART RODIER.

Witnesses:

OHAnLns M. JONES, E. J. TRACY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

